Rabbi Asher ben Yeḥiel, is usually called "Rabbeinu Asher" or "The רא"ש" (pronounced by most Israelis as "Rosh"; often in North America it is pronounced like the English word "rush"*). However, today I've stumbled across two unsourced internet references to him that call him "Asheri". How widely used is this nickname, and are there any others?

Also: How is the nickname "Asheri" used? Does it stand alone, or is it "Rav Asheri" or "HaAsheri" ("The Asheri"), or some other formulation?

They probably meant Hagos Ashrei which doubleaa mentioned ,he wrote on the Rosh and was not the Rosh himself.
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samMar 12 '13 at 16:41

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@DannySchoemann, in my experience most people pronounce Rabbi Shimshon's name with a Pataḥ under the Reish, so it comes out like Räsh, as opposed to Rabbeinu Asher's name, which is pronounced with a Kametz and sounds more like Rɵsh. But thank you for your comment; see my edit.
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Seth JMar 20 '13 at 14:03